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jellyfish medical definition
noun pl. jellyfish or jel·ly·fish·es
- Any of numerous marine coelenterates of the class Scyphozoa, some poisonous species of which, notably the Portuguese man-of-war, produce a toxin that can be injected into the skin by nematocysts on the tentacles, causing linear wheals.
- Any of various similar or related coelenterates.
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